Behind this rocky fortress the wagon was driven, and the first care of Harry was to water the animals, as they had not been allowed to quench their thirst on the way. They waited an hour or more for the appearance of the Professor and John. George went out on a quest back over the trail which they had just made, and almost reached the stream before he caught sight of them lurking through the trees and shrubbery.
They were relieved to know that the wagon was in safety, and after the stream was crossed the three delayed no longer, but hurried rapidly forward and soon reached the wagon, to the great relief of Harry and the boys.
"Let us haste to the river," was the Professor's hurried order, as he came up, and the yaks were at once urged forward, but as he passed the rocky wall, he cried out: "Wait, let us examine this first."
The boys knew that if, in such an emergency, he could call a halt, the appearance of the rock would reveal something that might be of value. The action of the Professor attracted the attention of John at once, and he turned to the wall and glanced along its face in an inquiring manner, and as he did so wandered along the rocky outline in a curious manner.
While the Professor was engaged in examining the formation John came back hurriedly into sight, in considerable agitation, and running up to Harry, grasped him by the arm and led him back. Harry followed, intensely interested, and the other boys also noted the movement and rushed over to the narrow trail which they had taken.
As they rounded a corner John and Harry had disappeared, and George was astounded. In a moment more Harry ran back and cried out: "Tell the Professor to come, quickly."
He appeared, as the unusual sight of the boys running after John had already attracted his attention, and when the boys reached the second turn and saw the Professor coming up, the latter was curious to know what the commotion meant.
"It means," answered Harry, "that we have found another cave."
The entrance was to the left, and was so hidden by shrubbery that only the utmost scrutiny enabled them to distinguish it.
They gazed at each other in astonishment. George was the first to speak: "Why wouldn't this be a good place to hide?"